GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Families leave the morning's briefings on the 29 miners and contractors trapped in the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Families leave the morning's briefings on the 29 miners and contractors trapped in the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the missing miners support each other after the morning's briefings on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the missing miners support each other after the morning's briefings on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two ... more

Photo: Martin Hunter, Getty Images

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the... Photo-443449.2093 - StamfordAdvocate

Image 4 of 27

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A RNZAF Hercules delivers a ventilation fan on the runway at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A RNZAF Hercules delivers a ventilation fan on the runway at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A ventilation fan is loaded onto a truck at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A ventilation fan is loaded onto a truck at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A ventilation fan is loaded onto a truck at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A ventilation fan is loaded onto a truck at the Greymouth Airport to be taken to the Pike River mine on November 23, 2010 in Greymouth, New Zealand. Police authorities ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: CEO of Pike River Coal Mine Peter Whittall shows a schematic drawing of the mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** Peter Whittall less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: CEO of Pike River Coal Mine Peter Whittall shows a schematic drawing of the mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: An aerial view of the drilling rig at the Pike River Coal Mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on November 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by NZPA-Pool/Getty Images)
Aerial view of drilling rig at Pike River Coal Mine, Greymouth, New Zealand, Tuesday, November 23, 2010. Credit:NZPA / POOL PICTURE. less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: An aerial view of the drilling rig at the Pike River Coal Mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: An aerial view of the drilling rig at the Pike River Coal Mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on November 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by NZPA-Pool/Getty Images)
Aerial view of drilling rig at Pike River Coal Mine, Greymouth, New Zealand, Tuesday, November 23, 2010. Credit:NZPA / POOL PICTURE. less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: An aerial view of the drilling rig at the Pike River Coal Mine on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: CEO of Pike River Coal Mine Peter Whittall shows CCTV footage of the portal of Pike River mine just before the explosion on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on November 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** Peter Whittall less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: CEO of Pike River Coal Mine Peter Whittall shows CCTV footage of the portal of Pike River mine just before the explosion on November 23, 2010 in Greymouth, New Zealand. ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A sign which reads "Our thoughts are with you all" is displayed in a Greymouth Streets in support of the 29 miners and contractors trapped in the Pike River mineon November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: A sign which reads "Our thoughts are with you all" is displayed in a Greymouth Streets in support of the 29 miners and contractors trapped in the Pike River mineon ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the missing miners support each other after the morning's briefings on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the missing miners support each other after the morning's briefings on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two ... more

Photo: Martin Hunter, Getty Images

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Friends and family of the... Photo-443468.2093 - StamfordAdvocate

Image 15 of 27

Taboola Gallery Frame Item-85307.2093 - StamfordAdvocate

Image 16 of 27

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Police Superintendent Gary Knowles speaks at a media briefing on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** Gary Knowles less

GREYMOUTH, NEW ZEALAND - NOVEMBER 23: Police Superintendent Gary Knowles speaks at a media briefing on November 23, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: CEO of Pike River Coal Mine Peter Whittall arrives for a media briefing on November 22, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two Britons, and a South African are amongst the New Zealand mine crew reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast on October 19. There has been no contact with the missing miners since the blast and specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** Peter Whittall less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: CEO of Pike River Coal Mine Peter Whittall arrives for a media briefing on November 22, 2010 in Greymouth, New Zealand. Police authorities confirmed two Australians, two ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Flowers and a note lay at the foot of the Strongman Mine Memorial, on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Flowers and a note lay at the foot of the Strongman Mine Memorial, on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Flowers and a note lay at the foot of the Strongman Mine Memorial on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Flowers and a note lay at the foot of the Strongman Mine Memorial on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike ... more

Photo: Martin Hunter, Getty Images

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Flowers and a note lay at the... Photo-443473.2093 - StamfordAdvocate

Image 22 of 27

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives comfort a man outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives comfort a man outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: New Zealand Prime Minister John Key (R) listens to questions during a press conference on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** John Key less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: New Zealand Prime Minister John Key (R) listens to questions during a press conference on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: Friends and relatives embrace outside the Greymouth Council Offices after a family police briefing on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency ... more

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: A somber looking Peter Whittall, CEO of Pike River Coal Mine speaks to the media during a press conference on November 22, 2010 in Greymouth, New Zealand. Ambulance and emergency crews are on site at the Pike River Coal underground mine after 29 miners were reported missing following a blast at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Martin Hunter/Getty Images) *** Local Caption *** Peter Whittall less

GREYMOUTH, NEW ZEALAND - NOVEMBER 22: A somber looking Peter Whittall, CEO of Pike River Coal Mine speaks to the media during a press conference on November 22, 2010 in Greymouth, New Zealand. Ambulance and ... more